Five blades creates massive amounts of surface area to transfer your engine's power to acceleration. The HighFive also has a loyal following among freshwater fishermen who fish in rough water due to the excellent handling of the 5-blade design. A HighFive will stay hooked up when the going gets rough. The design also makes the HighFive an excellent choice for back trolling.
If engine RPM's are good with a 3-blade prop, replace with same pitch HighFive.